Materials and Formulas 211 



7. Glue— Glycerin Solution 

 Glue— 9 parts 

 Glycerin— 1 part 



Warm glue in double boiler; when thin, add glycerin and mix 

 thoroughly. Always warm glue for thinning and stir before 

 applying. 



Casting Compound 

 Dextrin— 5 pounds 

 Whiting— 5 pounds 

 Asbestos— 5 pounds 

 Water— 1 gallon 

 Glycerin— 3 ounces 

 Carbolic acid— 1 teaspoon 



Mix whiting and asbestos in a large receptacle which has room 

 to spare. Boil the water and add dextrin gradually. Keep stir- 

 ring or the dextrin will settle to the bottom in chunks. Add 

 glycerin and carbolic acid to dextrin and water. Pour the solu- 

 tion into the basin or bucket which holds the asbestos and 

 whiting. Mix thoroughly. 



This mixture can be stored in an air-tight container for an 

 indefinite period of time. I usually prepare a batch that will 

 fill a 10-gallon crock, and then I remove the compound by 

 the panful whenever necessary. 



When ready for casting, add water and mix well until the 

 mixture is well thinned out. Then keep adding plaster of Paris 

 and kneading the compound until it reaches a heavy con- 

 sistency which can be spread easily with a spatula. 



